|Publication number||US7990319 B2|
|Application number||US 11/912,837|
|Publication date||Aug 2, 2011|
|Filing date||Apr 26, 2006|
|Priority date||Apr 27, 2005|
|Also published as||CN101167215A, EP1878088A1, US20090201209, WO2006114771A1|
|Publication number||11912837, 912837, PCT/2006/51302, PCT/IB/2006/051302, PCT/IB/2006/51302, PCT/IB/6/051302, PCT/IB/6/51302, PCT/IB2006/051302, PCT/IB2006/51302, PCT/IB2006051302, PCT/IB200651302, PCT/IB6/051302, PCT/IB6/51302, PCT/IB6051302, PCT/IB651302, US 7990319 B2, US 7990319B2, US-B2-7990319, US7990319 B2, US7990319B2|
|Original Assignee||Epcos Ag|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (17), Referenced by (3), Classifications (14), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention relates to a radio device operating over a plurality of bands comprising a casing having a front cover and a back cover, an antenna arrangement, a radio frequency circuit set and a matching unit for connecting the antenna arrangement to the radio frequency circuit set
Radio devices, such as mobile phone handsets, incorporate an internal antenna. The antennas are small (relative to the working wavelength). So, the matching for a large band becomes difficult. Moreover, the radio devices must operate over a plurality of bands, which lie between 820 MHz and 2200 MHz. Another requirement is that the radiated energy is the lowest possible for the head of the user (SAR).
It is an object of the invention to satisfy all these more or less contradictory requirements.
The invention is based on the following patent documents: The application WO 03/094290, which discloses notably means for matching an antenna and U.S. Pat. No. 6,674,411, which discloses a planar inverted F antenna (PIFA antenna).
The invention proposes a radio device of the type defined in the opening paragraph, which provides good performances in view to satisfying the cited requirements.
The invention proposes also an antenna arrangement suited for the above-mentioned radio device.
Such a radio device is characterized in that:
These and other aspects of the invention are apparent from and will be elucidated, by way of non-limitative example, with reference to the embodiment(s) described hereinafter.
In the drawings:
According to an aspect of the present invention, the antenna arrangement comprises a high-frequency part 17 related to the higher frequency bands and a low frequency part 20 related to the lower frequency bands. Each antenna part comprises normal sub-parts 21 and 22 (respectively for the parts 17 and 20), which are substantially normal to the front cover (i.e. the PCB 12) and back cover sub-parts 27 and 26 (respectively for the parts 17 and 20), which are parallel to the front cover. The bands concerned are in the 820 MHz-2200 MHz range. The antenna arrangement shown is contained within dimensions 40×20×8 mm (approximately the same volume as a conventional dual/tri-band antenna). The PCB measures 100×40×1 mm and is modeled as a copper sheet. The antenna arrangement is designed to retain predominantly series resonant characteristics: this allows the antennas to be tuned using only series components, minimizing losses.
The reflection coefficients of the low and high-frequency antennas (S11 and S22 respectively) are shown in
The insulation between the two antennas (S21) is shown in
In a preferred embodiment, slots 30 and 31 are provided. They are located in the plane of the antenna that is normal to the front and back covers of the phone, as illustrated in
The antenna arrangement of the
Both the slots and the feed and shorting pins in combination with shunt capacitors may act as bandpass filters, increasing the insulation between the two antennas. Both the slots and shorting pins in combination with shunt capacitors may also reduce the worst-case reflection coefficient of the antennas, minimizing the losses in the subsequent matching circuit.
The feed and shorting pin widths are chosen such that the antenna resistance is nominally lower than the system impedance. This minimizes the reflection coefficient over the wide bandwidth that must be covered by each antenna. It also makes an allowance for user interaction, which tends to increase the antenna resistance (while decreasing its quality factor).
Note that the antenna resistance is greater than approximately 20 ohms over each band. Without any further means, the worst-case resistance presented by the antennas to the front-end circuitry would be less than 5 ohms. Since conventional switches have typical “on” resistances of a few ohms, this would result in significant losses: MEMS switches would be required to alleviate this. With the slots, shorting pins and double-tuning capacitors, the worst-case resistance is approximately 25 ohms. Here, conventional switches can be used with acceptable losses.
The matching unit shown in
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US9077087||Feb 22, 2013||Jul 7, 2015||Hong Kong Science and Technology Research Institute Co., Ltd.||Antennas using over-coupling for wide-band operation|
|US9160074 *||Nov 12, 2012||Oct 13, 2015||Ethertronics, Inc.||Modal antenna with correlation management for diversity applications|
|US20130147672 *||Nov 12, 2012||Jun 13, 2013||Ethertronics, Inc.||Modal antenna with correlation management for diversity applications|
|U.S. Classification||343/700.0MS, 343/893, 343/876|
|International Classification||H01Q3/24, H01Q1/38, H01Q21/00|
|Cooperative Classification||H01Q1/243, H01Q5/00, H01Q9/0421, H01Q5/40|
|European Classification||H01Q9/04B2, H01Q1/24A1A, H01Q5/00M, H01Q5/00|
|Jul 22, 2008||AS||Assignment|
Owner name: EPCOS AG, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BOYLE, KEVIN;REEL/FRAME:021270/0151
Effective date: 20080625
|Jan 28, 2010||AS||Assignment|
Owner name: EPCOS AG,GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NXP B.V.;REEL/FRAME:023862/0284
Effective date: 20080303
|Nov 13, 2013||AS||Assignment|
Owner name: QUALCOMM TECHNOLOGIES, INC., CALIFORNIA
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:EPCOS AG;REEL/FRAME:031590/0576
Effective date: 20131111
|Dec 31, 2014||FPAY||Fee payment|
Year of fee payment: 4